usps flat rate shipping small box

usps flat rate shipping small box is a practical solution for sending small, dense items within the United States. The cost remains fixed regardless of weight (up to 70 lbs), making it ideal for e-commerce sellers or personal users seeking price predictability. The USPS Priority Mail Small Flat Rate Box typically measures 8 5/8″ x 5 3/8″ x 1 5/8″ and includes 1–3 business day delivery with tracking and basic insurance. Businesses can order these boxes for free and integrate them into automated shipping workflows. Understanding flat rate shipping helps reduce costs and streamline packaging strategies.